Spectrum of a frequency modulated pulse width modulation signal

KILINÇ S., Cabuk G.

INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS, vol.43, no.3, pp.390-400, 2015 (SCI-Expanded, Scopus) identifier identifier

  • Publication Type: Article / Article
  • Volume: 43 Issue: 3
  • Publication Date: 2015
  • Doi Number: 10.1002/cta.1948
  • Journal Name: INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.390-400
  • Keywords: Pulse width modulation, switched mode power supplies, frequency modulation, spectral analysis
  • Dokuz Eylül University Affiliated: Yes

Abstract

In power electronics, the switching elements are controlled by pulse width modulated (PWM) signals making their currents on and off repeatedly. This might cause electromagnetic interference (EMI) problems especially in switched mode power supplies. One method for mitigating the EMI is to use the frequency modulation technique in the control signal of the switching metal-oxide-semiconductor field-effect transistor. According to this approach, frequency of the PWM signal is modulated in order to spread its spectrum and hence reduce the EMI levels. This paper presents the theoretical analysis for the spectrum of a frequency modulated PWM signal. Copyright (c) 2013 John Wiley & Sons, Ltd.